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The zero adjustment of the inner diameter dial gauge applies the special ring gauge as specified. However, it is impossible to equip small and medium-sized factories with more special ring gauges. It is therefore common to adjust the inner diameter dial gauge zero with a micrometer. Most micrometer micrometer screws have a certain amount of axial turbulence. The micrometer calibration procedure stipulates that the axial turbulence of the micrometer screw should not exceed 0.01 mm. When the amount of block is used to check the indication error of the micrometer, the direction of the force is applied.